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https://issues.apache.org/jira/browse/CALCITE-4173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17193104#comment-17193104
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Julian Hyde commented on CALCITE-4173:
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CALCITE-4237 is now fixed.
> Add internal SEARCH operator and Sarg literal, replacing use of IN in RexCall
> -----------------------------------------------------------------------------
>
> Key: CALCITE-4173
> URL: https://issues.apache.org/jira/browse/CALCITE-4173
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.26.0
>
> Time Spent: 8h 50m
> Remaining Estimate: 0h
>
> Add internal SEARCH operator and Sarg literal, replacing use of IN in RexCall.
> Recently we started to allow IN in RexCalls to represent lists of constant
> values; previously it had only been allowed in SqlCall. The use is confusing,
> because a RexSubQuery is a sub-class of RexCall that may also use IN as its
> operator.
> More important, we would like to be able to represent more general search
> arguments in a single RexCall. Examples:
> * {{x BETWEEN 3 AND 10}}
> * {{x > 3 AND x <= 10}}
> * {{x NOT BETWEEN 3 AND 10}}
> * {{x IS NULL OR x BETWEEN 3 AND 100 AND x != 50 OR x IN (200, 300, 400)}}
> * {{x > 5 AND x < 10 AND x IN (3, 8, 10, 20)}}
> All of these can be converted to sets of ranges, where each range has a lower
> or upper bound (or both), bounds can be open or closed, plus a flag to say
> whether NULL is an allowed value. Guava's RangeSet is an efficient
> implementation of range sets.
> This change would create a new class {{Sarg}} to represent a range set as a
> literal. The new internal SEARCH operator tests whether an operand belongs to
> the range set.
> A RexCall to SEARCH is converted back to SQL, typically an IN or OR.
> This change would obsolete the use of IN in {{RexCall}} to represent a fixed
> list of values. (This is a breaking change, but when we first allowed IN in
> {{RexCall}}, in CALCITE-2444, it was only intended to be for
> {{RelToSqlConverter}}. Most people still believe that [IN is not
> allowed|https://lists.apache.org/thread.html/e1c5d56ecca7c1bc3608344ceac9b209bb8100fbca1c1928feb9cce7%40%3Cdev.calcite.apache.org%3E].)
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